针对X射线双能CT成像的正弦图快速配准方法

双能CI成像技术在医学和安检领域应用广泛,可分为真双能成像和伪双能成像两种类型.针对真双能成像中存在的正弦图空间位置不匹配的问题,提出了一种高低能正弦图快速配准方法.该方法利用相关系数来检测高低能正弦图投影角度方向的相对位移.针对二维相关系数计算量大的问题,采用对正弦图横向左半部分或者右半部分进行横向投影的方法获取一维...

Fast sinogram registration method for X-ray dual-energy computed tomography

Dual-energy CT imaging technique is widely used in the field of medicine and security inspection and can be classified into two types: true dual-energy imaging and pseudo dual-energy imaging.Aiming at the mismatching of spatial location of high and low energy sinograms,one fast registration method for high and low energy sinograms is put forward.According to the proposed algorithm,the relative displacement on the projection angle of high and low sinograms is detected using correlation coefficient.Because of the large computation of two-dimensional correlation coefficient,the right half of sinogram or the left half of the sinogram is horizontally projected to convert two-dimensional signal to one-dimensional signal.The fast calculation method of correlation coefficient for one-dimensional signal is designed and then a fast numerical algorithm for the solution of maximum correlation coefficient is put forward to detect the displacement of one-dimensional signal,and then the relative displacement of high and low sinograms can be got.So the sinogram registration can be accomplished.Actual experimental results verify the effectiveness of the algorithm.